Vallejo High School has been stripped of its Academic Performance Index score this year due to a teacher's violation of a standardized test security affidavit, according to documents that surfaced earlier this week.

The API is the state's measure of academic achievement and is based primarily on state standardized tests.

During the science portion of the exam earlier this year at Vallejo High, the teacher administering the test asked students to use a testing strategy in which, on a separate piece of paper, students jotted down the number of the questions into three categories: those they knew, those they might know, and those they did not know, according to the irregularity report.

After finishing the test, the students were taught to go back and check the answers on the second category and try to use elimination to pick the best answer in the third category. This was a standard strategy used by the teacher during classroom tests, the report said.